CONTROL OVER WINDING INSULATION DEFECTS – THE EFFECTIVE WAY TO IMPROVE RELIABILITY OF ELECTRIC MOTORS IN MINING, CONSTRUCTION AND OTHER INDUSTRIES

• Main Author: Gennady V. Smirnov
• Format: Article
• Language: Russian
• Published: Tomsk Polytechnic University 2020-03-01
• Series: Известия Томского политехнического университета: Инжиниринг георесурсов
• Subjects: control; defect; length; primary converter of defects; error; speed sensor; voltage; time constant; low-voltage winding; corona discharge
• Online Access: http://izvestiya.tpu.ru/archive/article/view/2553/2185

The relevance of the work. Such spheres of human activity, as geological exploration, production, transportation and recycling use the means of mechanization and automation with application of different types of electric drives. The reliability of these devices is determined by winding insulation quality. In this regard, the search for effective means of controlling wire enamel insulation, improving the insulation quality, eliminating technological reasons of defect occurrence are popular and topical. The aim of the work is to research the influence of defect meter parameters, modes of control and gas-discharge defects flowing in a primary converter on accuracy of measuring the geometrical sizes of defects in wire insulation. Methods: oscilloscope, micrometer, theory of planning the experiments, methods of correlation estimates between the control parameters and regression analysis. Results. The author has revealed and stated in the paper the regularities of occurrence of systematic error in measuring defect extent when controlling wire isolation at winding, by the defectiveness meter using the gas-discharge sensor as the primary defect converter. It is shown that two factors: control U voltage on the defect gas-discharge sensor and the time constant τ= RC of the sensor discharge circuit, influence most of all the value of the specified errors. Using the correlation and regression analyses the adequate model of systematic error was constructed; it was established that the wire motion velocity has no significant effect on the magnitude of this error. When applying the theory of planning the experiments the author obtained the adequate equation based on bias from the control settings. The paper demonstrates the practical application of the established patterns to improve the accuracy of controlling the defect extent in wire insulation in gas sensor meters.